Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Postersession

HK 45.8: Poster

Wednesday, March 16, 2016, 18:30–20:30, S1/05 22-24

In-beam measurement of the ⁸⁵Rb(p,γ)⁸⁶Sr reaction cross section for the astrophysical γ process — •Lars Netterdon, Felix Heim, Jan Mayer, Philipp Scholz, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

The majority of the neutron-deficient p nuclei is believed to be produced during the so-called γ process. Other mechanisms for the production of these nuclei have been proposed, such as the rapid proton-capture process or the νp process. All processes have in common, that the involved reaction rates are calculated within the scope of the Hauser-Feshbach statistical model, as experimental data are rare. The quality of reaction rate predictions strongly depends on the underlying models for the nuclear-physics input parameters, such as particle+nucleus optical model potentials (OMP) or the γ-ray strength function. These models are tested and improved by comparing experimental total and partial cross sections with theoretical predictions.

In this contribution, first results of a cross-section measurement of the ⁸⁵Rb(p,γ)⁸⁶Sr reaction using in-beam γ-ray spectroscopy will be presented. The experiment was performed using the high-efficiency γ-ray spectrometer HORUS in Cologne. The experimental setup and preliminary data will be discussed and compared to statistical model predictions in order to test various models of the proton+nucleus OMP and the γ-ray strength functions.

Supported by the ULDETIS project within the UoC Excellence Initiative institutional strategy. P.S. and J.M. are supported by the Bonn-Cologne Graduate School for Physics and Astronomy.